2007 INFINITI QX56 Factory Service Manual

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Page 2913 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SYSTEM
TF-91
< SERVICE INFORMATION >
C
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TF
N
O
P
2. Check voltage between transfer control unit harness connector
terminals and ground.
OK or NG
OK >> GO TO

Page 2914 of 3061

INFINITI QX56 2007 Factory Service Manual TF-92
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYSTEM
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >> Inspection End.
NG >> Replace transfer control unit. Refer to

Page 2915 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SYSTEM
TF-93
< SERVICE INFORMATION >
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N
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3. Read out ON/OFF switching action of the “CL PRES SW” while
operating 4WD shift switch.
Without CONSUL

Page 2916 of 3061

INFINITI QX56 2007 Factory Service Manual TF-94
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYSTEM
3. Push and release clutch pressure switch and check continuity
between transfer terminal cord assembly terminal 7 and ground.
OK or NG
OK

Page 2917 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SYSTEM
TF-95
< SERVICE INFORMATION >
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TF
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Data are reference value and are measured between each terminal and ground.
CAUTION:
When using a circuit tes

TROUBLE DIAGNOSIS FOR SYSTEM
TF-95
< SERVICE INFORMATION >
C
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B
TF
N
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Data are reference value and are measured between each terminal and ground.
CAUTION:
When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.
DIAGNOSTIC PROCEDURE
1.CHECK LINE PRESSURE SWITCH SIGNAL
With CONSULT-II
1. Start engine.
2. Select “DATA MONITOR” mode for “ALL MODE AWD/4WD” with CONSULT-II.
3. Read out ON/OFF switching action of “LINE PRES SW” while
operating 4WD shift switch.
Without CONSULT-II
1. Start engine.
2. Check voltage between transfer control unit harness connector
terminals and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
2.CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND LINE PRESSURE SWITCH
1. Turn ignition switch “OFF”. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and the transfer terminal cord assembly harness con-
nector.
Te r m i n a lWire
colorItem Condition Data (Approx.)
35 BR/W Line pressure switch• Ignition switch: ON
• A/T selector lever “D” posi-
tion• 4WD shift switch: AUTO 0V
• Except the above
• The vehicle has been left at
room temperature for 5 min-
utes and more with ignition
switch in “OFF” position.• Ignition switch: ON
• A/T selector lever: "P" or "N"
position
• 4WD shift switch: other than
AUTOBattery voltage
Condition Display value
• A/T selector lever “D” position
• 4WD shift switch: AUTOON
• Except the above
• The vehicle has been left
at room temperature for 5
minutes and more with ig-
nition switch in “OFF” po-
sition.• Ignition switch: ON
• A/T selector lever: "P" or "N" po-
sition
• 4WD shift switch: other than
AUTOOFF
Connector Terminal ConditionVoltage
(Approx.)
E14335 -
Ground• A/T selector lever
“D” position4WD shift switch:
AUTO0V
• Except the above
• The vehicle has
been left at room
temperature for 5
minutes and more
with ignition switch
in “OFF” position.• Ignition switch:
ON
• A/T selector le-
ver: "P" or "N"
position
• 4WD shift
switch: other
than AUTOBattery
voltage
WDIA0142E
SDIA2751E

Page 2918 of 3061

INFINITI QX56 2007 Factory Service Manual TF-96
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYSTEM
3. Check continuity between transfer control unit harness connec-
tor E143 terminal 35 and transfer terminal cord assembly har-
ness connecto

Page 2919 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SYSTEM
TF-97
< SERVICE INFORMATION >
C
E
F
G
H
I
J
K
L
MA
B
TF
N
O
P
3. Push and release line pressure switch and check continuity
between transfer terminal cord assembly termina

TROUBLE DIAGNOSIS FOR SYSTEM
TF-97
< SERVICE INFORMATION >
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TF
N
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3. Push and release line pressure switch and check continuity
between transfer terminal cord assembly terminal 1 and ground.
4. If NG, replace the line pressure switch. Refer to TF-22, "
Loca-
tion of Electrical Parts".
Throttle Position Signal (ECM)INFOID:0000000003532547
DIAGNOSTIC PROCEDURE
1.CHECK DTC WITH ECM
Perform self-diagnosis with ECM. Refer to E C - 111 , "
CONSULT-II Function (ENGINE)".
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 2.
2.CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to TF-35, "
Transfer Control Unit Input/Output Signal Ref-
erence Value".
OK or NG
OK >> GO TO 3.
NG >> Check transfer control unit pin terminals for damage or loose connection with harness connector.
If any items are damaged, repair or replace damaged parts.
3.CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >> Inspection End.
NG >> Perform self-diagnosis with ECM again. Refer to EC-111, "
CONSULT-II Function (ENGINE)".
ABS Operation Signal (ABS)INFOID:0000000003532548
DIAGNOSTIC PROCEDURE
1.CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Perform self-diagnosis with ABS actuator and electric unit (control unit). Refer to BRC-26, "
CONSULT-II Func-
tion (ABS)" .
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 2.
2.CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to TF-35, "
Transfer Control Unit Input/Output Signal Ref-
erence Value".
OK or NG
OK >> GO TO 3.
NG >> Check transfer control unit pin terminals for damage or loose connection with harness connector.
If any items are damaged, repair or replace damaged parts.
3.CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
Terminal Condition Continuity
1 - GroundPush line pressure switch Yes
Release line pressure switch No
WDIA0172E

Page 2920 of 3061

INFINITI QX56 2007 Factory Service Manual TF-98
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYSTEM
OK >> Inspection End.
NG >> Perform self-diagnosis with ABS actuator and electric unit (control unit) again. Refer to BRC-26,
"CONSULT-II Fun

TF-98
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYSTEM
OK >> Inspection End.
NG >> Perform self-diagnosis with ABS actuator and electric unit (control unit) again. Refer to BRC-26,
"CONSULT-II Function (ABS)".
VDC Operation Signal (ABS)INFOID:0000000003532549
DIAGNOSTIC PROCEDURE
1.CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT
Perform self-diagnosis with ABS actuator and electric unit (control unit). Refer to BRC-26, "
CONSULT-II Func-
tion (ABS)".
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 2.
2.CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to TF-35, "
Transfer Control Unit Input/Output Signal Ref-
erence Value".
OK or NG
OK >> GO TO 3.
NG >> Check transfer control unit pin terminals for damage or loose connection with harness connector.
If any items are damaged, repair or replace damaged parts.
3.CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >> Inspection End.
NG >> Perform self-diagnosis with ABS actuator electric unit (control unit) again. Refer to BRC-26,
"CONSULT-II Function (ABS)".
TCS Operation Signal (ABS)INFOID:0000000003532550
DIAGNOSTIC PROCEDURE
1.CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Perform self-diagnosis with ABS actuator and electric unit (control unit). Refer to BRC-26, "
CONSULT-II Func-
tion (ABS)".
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 2.
2.CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to TF-35, "
Transfer Control Unit Input/Output Signal Ref-
erence Value".
OK or NG
OK >> GO TO 3.
NG >> Check transfer control unit pin terminals for damage or loose connection with harness connector.
If any items are damaged, repair or replace damaged parts.
3.CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK >> Inspection End.
NG >> Perform self-diagnosis with ABS actuator and electric unit (control unit) again. Refer to BRC-26,
"CONSULT-II Function (ABS)".

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